PIC16F84A_13 Datasheet, PDF (16/90 Pages) Microchip Technology – 18-pin Enhanced FLASH/EEPROM 8-Bit Microcontroller

PIC16F84A
TABLE 4-1: PORTA FUNCTIONS
Name
Bit0
Buffer Type
Function
RA0
bit0
TTL
Input/output
RA1
bit1
TTL
Input/output
RA2
bit2
TTL
Input/output
RA3
bit3
TTL
Input/output
RA4/T0CKI
bit4
ST
Input/output or external clock input for TMR0.
Output is open drain type.
Legend: TTL = TTL input, ST = Schmitt Trigger input
TABLE 4-2: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Address Name Bit 7 Bit 6 Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on Value on all
Power-on
other
Reset
RESETS
05h
PORTA
—
—
— RA4/T0CKI RA3 RA2 RA1 RA0 ---x xxxx ---u uuuu
85h
TRISA
—
—
—
TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 ---1 1111 ---1 1111
Legend: x = unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are unimplemented, read as '0'.
DS35007C-page 16
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